CN1175937C - Process for preparing slurry with wide granularities distribution by serial grinder - Google Patents
Process for preparing slurry with wide granularities distribution by serial grinder Download PDFInfo
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- CN1175937C CN1175937C CNB011380659A CN01138065A CN1175937C CN 1175937 C CN1175937 C CN 1175937C CN B011380659 A CNB011380659 A CN B011380659A CN 01138065 A CN01138065 A CN 01138065A CN 1175937 C CN1175937 C CN 1175937C
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Abstract
The present invention relates to a preparation method for slurry, particularly to a method for preparing slurry distributed with wide granularity by a grinding mill which is in series connected with twice material charge. Precrushed solid raw materials, water and a dispersing agent are placed in a first grinding mill for ore milling. The method is characterized in that the prepared slurry is added in a second grinding mill for continuous ore milling, the solid raw materials, the water and the dispersing agent are simultaneously and secondarily added in the second grinding mill, the slurry distributed with wide granularity is prepared after secondary ore milling, and the mass percentage of the solid material charge amount of the first grinding mill and the second grinding mill is from 20:80 to 50:50. The present invention widens the distribution width of the granularity in the slurry so as to simultaneously increase the concentration and the stability of the slurry, and the present invention has wide popularization and application value.
Description
One, affiliated technical field
The present invention relates to a kind of preparation method of slurry, particularly a kind ofly prepare the method for wide size-grade distribution solid-liquid slurry with connect twice pan feeding of grinding machine.
Two, background technology
Along with slurry widespread use in a lot of fields, how to prepare the attention that high stability, high density slurry have more and more caused people.Wet milling is to prepare the commonly used and simple and direct method of slurry.For concentration and the stability that improves slurry, length-to-diameter ratio, grinding mill barrel compartment, the adjustment mill of taking to adjust grinding machine usually is situated between (substituting part steel ball etc. as size and ratio, the use steel section of adjusting the ball mill ball size) or the methods such as feeding granularity of adjustment grinding machine realize.But the concentration that these measures all exist one or several processing parameter that has only changed grinding machine still can not fundamentally solve improves slurry and the problem of stability.Chinese patent application 87101684 has proposed a kind of method for preparing the stabilization coal water slurry.This method is to add in the readymade coal water slurry and can generate water-fast alkalimetal silicate or carbonate with calcium, magnesium ion, the concentration that is dissolved in calcium, magnesium ion in the liquid of slurry upper strata by continuous or alternate detection is controlled its add-on, guarantee that its add-on is enough to these ions are changed into water-fast compound, thereby make coal slurry stable and never degenerate in storage period.Though this method has certain effect to improving stability of coal slurry, because the grating situation not radical change as yet of solids in the slurry, so can not improve paste consistency simultaneously.Chinese patent application 85100543, propose to use humate or its sulfonate derivatives that the peat composed of rotten mosses, weathered coal or brown coal produced, can be used as the preparation solids content is the above high-concentration water-coal slurry additive of 55wt%, uses or mix use with other additives all to obtain certain reduction viscosity and stabilising effect.Though this method has certain effect to improving paste consistency, because the adding of additive causes the corresponding minimizing of point of contact between the particle in the slurry, so can't solve the problem of the stability of slurry.
Though above technical scheme respectively the concentration that improves slurry and stable aspect obtained some progress, but still there are not at present the high density that solves slurry simultaneously and the method for high stability, how to overcome the problem that prior art exists, become one of difficult problem that needs to be resolved hurrily in the current slurry field.
Three, summary of the invention
The object of the present invention is to provide a kind ofly to prepare the method for wide size-grade distribution solid-liquid slurry, by widening particle size distribution width in the solid-liquid slurry, reach the concentration that improves the solid-liquid slurry simultaneously and the effect of stability with connect twice pan feeding of grinding machine.
What propose according to the present invention prepares the method for wide size-grade distribution solid-liquid slurry with connect twice pan feeding of grinding machine, at first the solid material behind the precrushing, water and dispersion agent are placed first grinding machine ore grinding, it is characterized in that continuing ore grinding in second grinding machine of prepared solid-liquid slurry adding, secondary adds solid material, water and dispersion agent simultaneously, the solid-liquid slurry that makes behind secondary grinding is the solid-liquid slurry of wide size-grade distribution, and wherein the solid pan feeding mass percent example of the solid feeding of first grinding machine and second grinding machine is 20: 80 to 40: 60.One aspect of the present invention has remedied second fine grain deficiency of grinding machine ore grinding initial stage, makes its pan feeding just have certain fluidity in the ore grinding initial stage, promotes the cast and decline movement of mill Jie in grinding machine and rushes down motion, thereby improved the grinding efficiency of grinding machine; On the other hand, after solid material, water and the dispersant that solid-liquid slurry that first grinding machine makes and secondary add, the material size of having widened second grinding machine distributes, further improve the particle diameter distribution width and the particulate deposition efficiency of final solid-liquid slurry, thereby helped making the solid-liquid slurry of high density and high stability; The 3rd, the solid-liquid slurry that grinds owing to first grinding machine is not final solid-liquid slurry, can improve the initial flow of solid-liquid slurry by the ore milling concentration that reduces by first grinding machine, increase the cast and decline movement that mill is situated between in the grinding machine and rushed down motion, reduce the circular motion that mill is situated between, thereby improved the grinding efficiency of grinding machine.
The width of particle size distribution can calculate according to following formula in the solid-liquid slurry of the present invention:
In the formula, δ is the width of particle size distribution; D
nIt is the particle diameter of n grade; D
vVolume average particle size for particle; C
nIt is the percentage composition of n particle.The δ value is big more, and the tap density of particle is just high more in the solid-liquid slurry, and the tap density of particle is high more, has improved the deposition efficiency of powder in the solid-liquid slurry on the one hand; Increased interaction force and point of contact between powder particle on the other hand, the concentration of solid-liquid slurry and stability are just high more.
The present invention compared with prior art beneficial effect is: (1) has improved the grinding efficiency of grinding machine; (2) owing to widened the size distribution of final solid-liquid slurry, increase the particulate deposition efficiency, realized the high density and the high stability of solid-liquid slurry; (3) technology is simple, and is easy to operate, energy-conservation and efficient, has application value widely.
Four, accompanying drawing
To be the present invention prepare the process flow diagram of wide size-grade distribution solid-liquid slurry with connect twice pan feeding of grinding machine with accompanying drawing.
Five, embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment 1. prepares the method for the prosperous village 2# cleaned coal coal water slurry of wide size-grade distribution with connect twice pan feeding method of grinding machine.
Grinding machine pan feeding mass percent example with two grinding machines is the coal water slurry of 20: 80 to 40: the 60 wide size-grade distribution of preparation, output with 4kg/h, the coal pan feeding mass percent of two grinding machines is that the coal water slurry of 40: 60 wide size-grade distribution of preparation is an example: grinding machine (1) adopts XMB-Φ 240 * 330 type ball mills, volume is 13.57L, load is 1.8kg/h, solid material is selected prosperous village cleaned coal for use, coal feeding amount is 1.09kg/h, dispersion agent NDF add-on is 0.02kg/h (50wt%), adding entry is 0.69kg/h, the solid-liquid slurry that grinding machine (1) is made adds grinding machine (2), grinding machine (2) adopts XMB-Φ 300 * 400 type ball mills, volume is that 20L drops into raw material once more, coal feeding amount is 1.64kg/h, and the dispersion agent add-on is 0.02kg/h (50wt%), and adding entry is 0.54kg/h, ore grinding once more, the coal water slurry of the wide size-grade distribution that makes has high density and high stability.Grinding machine pan feeding mass percent example by two grinding machines is 20: 80, makes the coal water slurry of the high density high stability of 2 kinds of wide size-grade distribution at 30: 70.
Measure coal concentration, viscosity and the dynamic stability that the grinding machine pan feeding mass percent example that adopts separate unit ball mill (load is 2kg/h), two series connection grinding machines is 4 kinds of coal water slurry making in 20: 80,30: 70,40: 60 respectively by enterprise mark Q/3201NBJ02-1999, the coal particle diameter of measuring coal water slurry with laser particle analyzer distributes, by formula calculate the Tile Width of particle, the results are shown in Table 1.As seen, the Tile Width of using the present invention to make the particle of coal water slurry all has raising in various degree from table 1, and concentration and dynamic stability also improve with the increase of Tile Width, and two grinding machine pan feeding mass percent examples are that 30: 70 o'clock effects reach best.
The coal water slurry performance table of table 1 different process method preparation
| The preparation method | Coal concentration (wt%) | Apparent viscosity (mPaS) | The particle distribution width | Median size (μ m) | 24 hours dynamic settling speed (wt%/h) | |
| The separate unit ball mill | 67.5 | 1020 | 147.5 | 26.0 | 0.30 | |
| The grinding machine pan feeding mass percent example of two grinding machines | 20∶80 | 68.0 | 101 | 175.0 | 36.0 | 0.14 |
| 30∶70 | 69.5 | 980 | 231.0 | 27.0 | 0.04 | |
| 40∶60 | 68.3 | 1050 | 187.1 | 220 | 0.15 | |
Embodiment 2. prepares the method for the burnt slurry of Shandong refinery coke water of wide size-grade distribution with connect twice pan feeding method of grinding machine.
Grinding machine pan feeding mass percent example with two grinding machines is the burnt slurry of water of 20: 80 to 40: the 60 wide size-grade distribution of preparation, output with 4kg/h, the refinery coke pan feeding mass percent of two grinding machines is that the burnt slurry of the water of 30: 70 wide size-grade distribution of preparation is example: grinding machine (1) adopts XMB-Φ 240 * 330 type ball mills, volume is 13.57L, load is 1.38kg/h, solid material is selected the Shandong refinery coke for use, throw burnt amount and be 0.9kg/h, dispersion agent NDF add-on is 0.01kg/h (50wt%), the adding water yield is 0.47kg/h, the solid-liquid slurry that grinding machine (1) is made adds grinding machine (2), grinding machine (2) adopts XMB-Φ 300 * 400 type ball mills, volume is that 20L drops into raw material once more, throw burnt amount and be 2.1kg/h, the dispersion agent add-on is 0.02kg/h (50wt%), and adding entry is 0.50kg/h, ore grinding once more, the burnt slurry of the water of the wide size-grade distribution that makes has high density and high stability.Grinding machine pan feeding mass percent example by two grinding machines is 20: 80, makes the burnt slurry of water of the high density high stability of 2 kinds of wide size-grade distribution at 40: 60.
Measuring the grinding machine pan feeding mass percent example that adopts separate unit ball mill (load is 2kg/h) and two series connection grinding machines respectively with reference to enterprise mark Q/3201NBJ02-1999 is burnt burnt concentration, viscosity and the dynamic stabilities of starching of 4 kinds of water that made in 20: 80,30: 70,40: 60, the burnt particle diameter of measuring the burnt slurry of water with laser particle analyzer distributes, by formula calculate the Tile Width of particle, the results are shown in Table 2.As seen, the Tile Width of using the present invention to make the particle of the burnt slurry of water all has raising in various degree from table 2, and concentration and dynamic stability also improve with the increase of Tile Width, and two grinding machine pan feeding mass percent examples are that 30: 70 o'clock effects reach best.
The burnt slurry of the water performance table of table 2 different process method preparation
| The preparation method | Burnt concentration (wt%) | Apparent viscosity (mPaS) | The particle distribution width | Median size (μ m) | 24 hours dynamic settling speed (wt%/h) | |
| The separate unit ball mill | 72.0 | 1010 | 153.7 | 31.0 | 0.30 | |
| The grinding machine pan feeding mass percent example of two grinding machines | 20∶80 | 73.9 | 1000 | 200.4 | 25.6 | 0.13 |
| 30∶70 | 74.7 | 980 | 238.6 | 23.8 | 0.07 | |
| 40∶60 | 73.6 | 1010 | 198.3 | 22.7 | 0.14 | |
Claims (2)
1, a kind ofly prepares the method for wide size-grade distribution solid-liquid slurry with connect twice pan feeding of grinding machine, at first the solid material behind the precrushing, water and dispersion agent are placed first grinding machine ore grinding, it is characterized in that continuing ore grinding in second grinding machine of prepared solid-liquid slurry adding, secondary adds solid material, water and dispersion agent simultaneously, the solid-liquid slurry that makes behind secondary grinding is the solid-liquid slurry of wide size-grade distribution, and wherein the solid feeding mass percent example of the solid feeding of first grinding machine and second grinding machine is 20: 80 to 40: 60.
2, according to claim 1ly prepare the method for wide size-grade distribution solid-liquid slurry, it is characterized in that the solid feeding of first grinding machine and the solid feeding mass percent example of second grinding machine are 30: 70 with connect twice pan feeding of grinding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011380659A CN1175937C (en) | 2001-12-30 | 2001-12-30 | Process for preparing slurry with wide granularities distribution by serial grinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011380659A CN1175937C (en) | 2001-12-30 | 2001-12-30 | Process for preparing slurry with wide granularities distribution by serial grinder |
Publications (2)
| Publication Number | Publication Date |
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| CN1356177A CN1356177A (en) | 2002-07-03 |
| CN1175937C true CN1175937C (en) | 2004-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011380659A Expired - Fee Related CN1175937C (en) | 2001-12-30 | 2001-12-30 | Process for preparing slurry with wide granularities distribution by serial grinder |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107727543B (en) * | 2017-10-17 | 2020-06-05 | 佛山市南海港能燃料物料有限公司 | Coal water slurry slurrying test method |
| CN107987904A (en) * | 2017-12-11 | 2018-05-04 | 南京大学 | A kind of method that partial reflux and dosing twice prepare high concentration gasification water-coal-slurry |
| CN108855539A (en) * | 2018-06-23 | 2018-11-23 | 宁波中科远东催化工程技术有限公司 | A kind of production line and production method of water-saving high solids content slurry |
| CN110699131B (en) * | 2019-10-24 | 2021-11-05 | 中煤科工清洁能源股份有限公司 | Preparation method of blended coal-water coal slurry |
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